.box{
	&.faculty{
		h2:before{
			background-position: 0 -28px;
		}
	}
	&.weibo{
		h2:before{
			background-position: 0 -14px;
		}
	}
	&.renren{
		h2:before{
			background-position: 0 0;
		}
	}
}